I was the one that first brought it up in the last sram vs shimano vs campy thread. I test drove a bike at my LBS that had the Rival groupset and I experienced this. I was completely oblivious to this problem before I experienced it, so I was not influenced by any other testimony and I discovered this by myself. It could have been just inexperience with the system (I test drove it for about a mile). I think that campy and shimano are just a bit more idiot proof.